[sdiy] SMT transistor for white noise?

[Mike Beauchamp]

I'm noticing my latest batch of MMBT3904 by ONSEMI are barely creating 
any white noise, requiring about 8000x gain to get up to +/- 5V.

Previous batches of the MMBT3904 only required about 500x gain to get up 
to +/- 5V. When I was using TH 2N3904, I think the gain required was 
only about 200x.

This much gain is also making something on the board (ceramic caps, the 
transistor itself?) pretty microphonic and tapping on the board is now 
audible.

Before I order a few dozen samples of different transistors off digikey 
to test, I'm wondering if anybody had any go-to parts for SMT 
transistors that are still noisy?

Mike